Currently available on eBay:
* $49.95 for an i5-5300U at 2.3GHz, 4GB of RAM, and 128GB of SSD storage
* $89.00 for an i3-7100U at 2.4GHz, 8GB of RAM, and 256GB of SSD storage
* $135.00 for an i7-5557U at 3.1GHz, 16GB of RAM, and 256GB of SSD storage
...all loaded with ample driver support, extensive connectivity options, and bog-standard x86-64 instructions.
Obviously, there will always be use cases that call for a tiny ARM SoC and nothing else, but plenty of the applications for which people will buy an ARM SoC (e.g., Kodi/Jellyfin/Plex/Emby media centers, RetroArch gaming machines, Minecraft servers, streaming servers, web servers, network filtering, seedboxes, etc.) are better served by a used Intel NUC.